Frank hoover



(No Model.)

F- H O 0 VER. INSULATOR.

N0. 575,952. Patented Jan. Z6, 1897.

UNITED STATES PATENT OFFICE.

FRANK HOOVER, OF PADUOAI-I, KENTUCKY, ASSIGNOR OF TVO-Tl-IIRDS TO WILLIAM lLUNDY BENNETT AND DAVID GAMBLE MURRELL, OF SAME PLACE.

lNsULAToR.

SPECIFICATION forming part of Letters Patent No. 575,952, dated January 26,1897.

Application iiled May l 9 l 8 9 6.

To @ZZ whom, it may concern:

Beit known that I, FRANK HOOVER, residing at Paducah, in the county of McCracken and State of Kentucky, have invented a new and Improved Insulator, of which the following is a specication.

This invention relates generally to insulators, and more particularly to an improved insulator adapted for use upon the cross-arm of an ordinary telegraph-pole or other electric-wire supports requiring the use of an in sulator.

The most common method of securing the line-wires of a telegraph or telephone system consists in the employment of a cross-arm having a series of upright pins, to which are attached glass insulating knobs, around which the fastening-wire is passed or looped in order to secure the line-wire to said glass or insulating knob. Several other modes of accomplishing this purpose have also been devised, but they have been more or less complicated and require considerable time and labor in their attachment and manipulation. Furthermore, the knobs now employed are liable to be broken and very often the upright points are broken off.

The object of my invention therefore is to provide an exceedingly cheap and simple construction of insulator, made of any insulating material, but preferably of glass, one which can be quickly and easily applied to the crossarm and one which is not liable to become broken or get out of order.

Another object is to provide an insulator which is applicable to other devices besides the cross-arm of a telegraph-pole.

Vith these various objects in view my invention consists in the peculiar construction of the various parts and in their novel combination or arrangement, all of which will be fully described hereinafter and pointed out in the claims.

In the drawings forminga part of this specification, Figure 1 is a view showing the invention in use. Fig. 2 is a detail view of a portion of the cross-arm, showing the insulator secured therein. Fig. 3 is a detail view of the same portion with the insulator removed. Fig. 4 shows the insulator detached from the cross-arm. Fig. 5 is a longitudinal Serial No. 592,237. (No model.)

section of the cross-arm and insulator, and Fig. 6 is atransverse section of the same parts.

In carrying out my invention I employ a cross-arm A, which is attached to the ordinary telegraph-pole in the usual manner. This cross-arm, however, has a transverse recess or opening B, essentially circular in form and having a narrow opening B at the bottom. The lower edges of the cross-arm are cut out, as shown at B2, adjacent to the circular opening or recess B. A socket Gis produced centrally in the top of the recess B, the purpose of said socket being to receive the projecting lug or knob D upon the insulating-block E, said block being essentially semicircular in cross-section and adapted to fit in the top of the recess or opening. The lower face of this insulating-block E has a longitudinal groove E', in which the line-wire XV is adapted to seat. The side edges of the block E are cut away slightly at E2 in order that the block can be lowered sufficiently below the top of the recess in order to have the lug D clear the top until it reaches the point where it is to ascend into the socket C.

The line-wire IV, resting in the longitudinal groove E', is secured therein by means of a lower securing insulatingblock F, also semicircular in cross-section and adapted to be slid into the opening under the upper block and wire, the eXtreme lower portion of said block resting in the opening B', said block being longitudinally grooved, as shown at F', the purpose of which is to form a guide for the securing-wire IV,\vliich is passed under the bottom of the block F and wrapped around the line-wire W at its ends. By this arrangement it will be impossible for the lower block to be dislocated, and as long as the lower block remains in place it will be impossible for the line-wire to become displaced.

If desired, the blocks E and F may be slightly tapering in order to bind more closely in the circular recess or opening, but this is not absolutely essential, as the adhesion between the wood and the glass will be sufficient to prevent any transverse movement of the insulating-blocks.

vIt will thus be seen that I provide an eX- ceedingly cheap, simple, and durable form IOO el insulator, one which can be quickly and easily applied and one which is not likelT to get out of order.

Having thus described my i11vention,\\'liat I claim as new, and desire to secure by Letters latent, iS-

ll. In an insulator', a cross arni or tiinber having a circular lrecess or opening 'formed with a socket in the center, oi' the top, a top i11sulating-blockhaving a central lug` adapted to lit the socket, and the bottom insulating,rblock adapted to Iit under the upper block within the circular recess or opening', substantially as shown and described.

2. In an insulator, a cross arln or timber having; a transverse circular recess or openin e; provided with a central socket in the top, the upper insulaling-block having` a projecting' lug adapted Alo lit lhe socket, the lower face oi' said bleek having;1 a longitudinal groove to receive the line-wire, and the lower insulating-bloek ior securing the line\vire, snbstantially as shown and described.

i3. ln an insulator, the cross arin ortinibcr having a transverse recess cssentiallv circular in shape and open at the bottoni, said cess having a central socket in the top, the upper insulating-bloek having,` a lug adapted to iit the socket, and the longitiulinal `groove to receive the line-Wire, and the lower insulating-block adapted to bind thc "Wire upon the upper block, substantially as shown and described.

et. The combination with the cross-arm hav in; a transverse circular recess open at the bottoni, and provided with a socket in the top, of the upper iusulatii'ig-block havin a projecting lui;l adapted to lit the socket, and the longitudinal groove adapted to receive the line wire, the lower insulating,` block adapted to iit in the recess under ihe bottoni oi the upper block, and line-whe, said block having a longitudinal groove on the bottoni, and the fasteningwire, all arranged and adapted to operate, siibslianlially as shown and described.

AFRANK 'I iOOVlGlI. ll'itnesscs:

OSCAR Kanu, .I1 V. GREI'F- 

